I have used Paxton gear many times when installed access control systems to buildings. There website is
http://paxton.co.uk/ and should give you plenty of information to point you in the right direction as to what you require for your needs.
The gear is not cheap to be fair (no access control system is to be honest) but works really well, they provide good support and they equipment is very hard wearing. You can even find some eBay bargains too.
As with most things, shop around, prices can vary from retailer to retailer.
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